Sometimes in Android development you find designers that make your assets names with "-" this makes the android compiler to fail as assets cannot have "-", I create this script to solve this problem recursively renaming the files and replacing "-" with "_" plus making them lowercase.

Normalize android assets

#!/bin/bash 
# Normalize assets
# Sometimes in Android development you find designers that make your assets names with "-" this makes
# the android compiler to fail as assets cannot have "-", I create this script to solve this problem
# recursively renaming the files and replacing "-" with "_" plus making them lowercase.
#
# Instructions:
# 1- Move this script to your Android {PROJECT_BASE_FOLDER}/app/src/main/res 
# 2- run it with sudo ex: "sudo ./rename_script.sh"

for f in drawable-*/*; do 
    MYDIR=$(dirname $f) # Obtaining dirname
    MYFILE=$(basename $f) # Obtaining filename
    SUB=`echo $MYFILE | sed 's/-/_/g' | tr [:upper:] [:lower:]` # Replacing "-" in filename for "_" plus making lowercase
    echo "Moving File $MYDIR/$MYFILE -> $MYDIR/$SUB" #printing info to double check
    mv $MYDIR/$MYFILE $MYDIR/$SUB #moving old file to new file (need sudo)
done